This is useful in the support view in case the audit log data is
stale and user counts are not updated for billing.
Also, renames formatting function for optional datetimes that is
used in the support and activity views/charts. And instead of
showing these datetime strings in the eastern US timezone, we
now show and label them as UTC.
Also, makes small updates to `next_plan_forms_support.html`.
Removes unneeded "btn" and "btn-default" classes, and updates
the placeholder text for the input as not marked for translation.
View functions in `analytics/views/support.py` are moved to
`corporate/views/support.py`.
Shared activity functions in `analytics/views/activity_common.py`
are moved to `corporate/lib/activity.py`, which was also renamed
from `corporate/lib/analytics.py`.
Adds a helper since there are only a few different parameters for
all BillingSession child clases, `build_support_url`.
Also, renames `get_support_url` to more explicitly note that it
is for realms: `get_realm_support_url`.
This commit performs a minor update in 'from_name' text for
'support' and 'sponsorship' emails.
Removes capitalization and adds a comment specifying that the
emails are not user-facing.